man/timesyncd.conf.xml

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<refentry id="timesyncd.conf" conditional='ENABLE_TIMESYNCD'>
        <refentryinfo>
                <title>timesyncd.conf</title>
                <productname>systemd</productname>

                <authorgroup>
                        <author>
                                <contrib>Developer</contrib>
                                <firstname>Lennart</firstname>
                                <surname>Poettering</surname>
                                <email>lennart@poettering.net</email>
                        </author>
                </authorgroup>
        </refentryinfo>

        <refmeta>
                <refentrytitle>timesyncd.conf</refentrytitle>
                <manvolnum>5</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>timesyncd.conf</refname>
                <refpurpose>Network Time Synchronization configuration file</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <para><filename>/etc/systemd/timesyncd.conf</filename></para>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para>When starting, systemd-timesyncd will read the
                configuration file
                <filename>timesyncd.conf</filename>.  This
                configuration file controls NTP network time
                synchronization.</para>

        </refsect1>

        <refsect1>
                <title>Options</title>

                <variablelist class='network-directives'>

                        <varlistentry>
                                <term><varname>NTP=</varname></term>
                                <listitem><para>A space separated list
                                of NTP servers host names or IP
                                addresses. During runtime this list is
                                combined with any per-interface NTP
                                servers acquired from
                                <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. systemd-timesyncd
                                will contact all configured system or
                                per-interface servers in turn until
                                one is found that responds. This
                                setting defaults to the empty
                                list.</para></listitem>
                        </varlistentry>

                        <varlistentry>
                                <term><varname>FallbackNTP=</varname></term>
                                <listitem><para>A space separated list
                                of NTP server host names or IP
                                addresses to be used as the fallback
                                NTP servers. Any per-interface NTP
                                servers obtained from
                                <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                                take precedence over this setting, as
                                do any servers set via
                                <varname>NTP=</varname> above. This
                                setting is hence only used if no other
                                NTP server information is known. If
                                this option is not given, a
                                compiled-in list of NTP servers is
                                used instead.</para></listitem>
                        </varlistentry>

                </variablelist>
        </refsect1>

        <refsect1>
                  <title>See Also</title>
                  <para>
                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd-timesyncd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
                  </para>
        </refsect1>

</refentry>